Welcome back, Vivian!
My favorite thing about Castaway Cay is that there is so much to do, but so much leisure time to enjoy as well! The
Extreme Getaway Package on Castaway Cay includes snorkel rental, bike rentals, float and tube rentals and Castaway Ray's Stingray Adventure. The stingray adventure will include a 15 minute orientation, followed by time interacting with the stingrays and snorkel time in the secluded area of Stingray Bay. You'll really enjoy this experience!
After that, you've got all day to experience the rest of Castaway Cay at your leisure. Stop in to rent your bikes whenever you're ready to take a loop around the island (I'd suggest going earlier before the peak of summer sun). Then, enjoy relaxing in the water off Family Beach as you float in your tubes and take in the gorgeous views!
When you're ready for more adventure, pick up your snorkeling gear and swim out to see what treasures Disney has hidden under the water. If you're hunting for hidden Mickey's, keep your eyes peeled under the water in the snorkeling lagoon!
Since most of this adventure is at your own pace and on your own time, I don't think this is too much to do at all, Vivian. The bike ride, float rentals and snorkeling rentals can be done whenever you are up for it, so no rush! Since "All Aboard" time is usually around 5:00 p.m. on Castaway Cay, you could really stay all day and still have time to get ready for dinner once you're back onboard. If you find that your daughter is worn out sooner, you can always head back to the ship earlier if you'd like.
Have fun planning the rest of your sailing, Vivian. I'm happy to help with any other questions you might have!